Assassin's Creed

Diablo

There's more, but those two hurt the worst.

GTA when I watched how GTA:V shifted from a single player game to a multiplayer online service.

Borderlands.

everything blizzard made.

Halo. Still holding out a sliver of hope that something cool in the universe will be made one day.

For me it was Pokemon.

Started in order and got the games new as they came out since DPP. The core of the game to me was exploration, Pokemon, then battles. However over time Battling got more and more popular to the point where the game just became boring. This was Black and White for me.

I hoped it would get better with each release, but it was Sun and Moon where I just couldn't care any more. After that I tried a game here and there. But nothing ever went back to that core of Exploration, new Pokemon the battling.

RIP Call of Duty, The Sims, Sim City, RCT, Super Smash Bros, Dragon Age, Halo, and GTA

The Elder Scrolls

Bethesda is dead.

Goodbye, Mass Effect.

Halo Infinite killed the franchise for me.

I still get my friends together to play Halo a couple times a year. But finishing Infinite was the first time I was no longer excited for the next installment.

Franchises are like bubble gum. If you try to make them last too much they lose all taste.

Besides all the mentioned ones, here are few from my side:

Need for Speed - played since 2 SE until Undercover. It is impossible to release the same game each year and the peak was MW'05.

Tony Hawk's Pro Skater - some may say American Wasteland was good. I didn't liked it but it was not as bad as anything after.

CODs - that is a pet peeve of mine. Great game, but it overstayed it's welcome. OG MW1 and MW2 still hold a special place in my heart.

Battlefield - same as above. BC and BF3 can't be beat.

World of Warcraft - that is an entirely different game to what it used to be imo.

Final Fantasy has been dead for a while. XI was the first major warning that things were no longer the same as an MMO was the last thing I expected from a mainline entry. XII was okay but it got rid of the overworld map and kept an MMO style of gameplay that felt like a slog to get through. Everything after that has been a disappointment heralded by extremely long dev times.

Planetside 2, for me.

It was never perfect, yet it's basically dying of old age. I think that's quite an achievement for an MMOFPS.

And I'm pretty sure there will never be another game like it, at its scale (and Foxhole doesn't count IMO).

Good bye Mario Kart... we'll always have not giving 1st place coins as an item in Wii.

Honestly used to love Minecraft, still have a soft spot and will likely return to it at some point. All that said, MSoft has made me give up on Mojang and Minecraft. Mojang also just ignores pretty serious feedback about gameplay and don't seem open to discussion with the community which always creates friction between mojang and the community.

Pokémon is starting to get there I think.

Mass Effect is still on the ropes for me. Andromeda was okay. I’m personally a bit over all the open world games.

Command & Conquer. I don't think I'll ever touch 4. Tempest Rising is great so there's that. I guess I'll just keep playing Tiberium Wars until time stops.

Ace Attorney (a.k.a. Phoenix Wright)

It peaked in the first trilogy. Each game built on what was good about the previous game while adding a new mechanism that flashed out another part of the game.

The second trilogy of games collapsed trying to follow it up. Both the writing and gameplay show the same issue. The games are trying to be a clean break with new characters and powers but the game designers were afraid that they might scare away fans of previous games, so the old characters and gameplay all come back to make an appearance. None of it works. The returning characters and gameplay are all very brief and shallow without the progression they got in their original games, but they take up so much space that the new characters and mechanics don't have room to build up over the course of 4-5 cases in a game.

I am now trudging through the two prequel games. The game designers finally had the determination to make a clean break, but it seems that they lost the magic of the initial games. There are new characters and new gameplay. There is too much plot, not enough game. There is too much (bad) writing between player interactions and when they happen, the game is more hand holdy to make sure the player is given a bucket of clues about what to do next. And there is no reason to make the game easier, since there is a new easy mode that plays the game for a player if they ever get stuck.

Me with Halo and Halo: Infinite

Destiny 2. It really only had a few banger DLCs, but those, alongside the beautiful gunplay, are what kept me on copium till The Final Shape. Dropped it after that.

Dungeon keeper